--- a+++ b/doc/cmucl/internals/addenda@@ -0,0 +1,16 @@+the function calling convention++%ECX is used for a count of function argument words, represented as a+fixnum, so it can also be thought of as a count of function argument+bytes.++The first three arguments are stored in registers. The remaining+arguments are stored on the stack.++The comments at the head of DEFINE-VOP (MORE-ARG) explain that+;;; More args are stored contiguously on the stack, starting immediately at the+;;; context pointer. The context pointer is not typed, so the lowtag is 0.++?? Once we switch into more-arg arrangement, %ecx no longer seems to be + used for argument count (judging from my walkthrough of kw arg parsing+ code while troubleshooting cold boot problems)